diff --git a/src/bin/meson.build b/src/bin/meson.build
index 476c4664..eb75b69d 100644
--- a/src/bin/meson.build
+++ b/src/bin/meson.build
@@ -56,6 +56,7 @@ tyfuzz_sources = ['termptyesc.c', 'termptyesc.h',
                   'termpty.c', 'termpty.h',
                   'config.c', 'config.h',
                   'col.c', 'col.h',
+                  'sb.c', 'sb.h',
                   'tyfuzz.c']
 tytest_sources = ['termptyesc.c', 'termptyesc.h',
                   'termptysave.c', 'termptysave.h',
@@ -66,6 +67,7 @@ tytest_sources = ['termptyesc.c', 'termptyesc.h',
                   'termpty.c', 'termpty.h',
                   'config.c', 'config.h',
                   'col.c', 'col.h',
+                  'sb.c', 'sb.h',
                   'md5/md5.c', 'md5/md5.h',
                   'tytest.c']
 
diff --git a/src/bin/termpty.c b/src/bin/termpty.c
index 35c1b721..44988a69 100644
--- a/src/bin/termpty.c
+++ b/src/bin/termpty.c
@@ -1241,15 +1241,18 @@ termpty_cell_get(Termpty *ty, int y_requested, int x_requested)
 void
 termpty_write(Termpty *ty, const char *input, int len)
 {
+#if defined(ENABLE_TESTS)
+   ty_sb_add(&ty->write_buffer, input, len);
+#else
    int fd = ty->fd;
-
-#if defined(ENABLE_FUZZING) || defined(ENABLE_TESTS)
+#if defined(ENABLE_FUZZING)
    fd = ty->fd_dev_null;
 #endif
    if (fd < 0) return;
    if (write(fd, input, len) < 0)
      ERR(_("Could not write to file descriptor %d: %s"),
          fd, strerror(errno));
+#endif
 }
 
 struct screen_info
diff --git a/src/bin/termpty.h b/src/bin/termpty.h
index d8206436..7c0c05f0 100644
--- a/src/bin/termpty.h
+++ b/src/bin/termpty.h
@@ -3,6 +3,7 @@
 
 #include "config.h"
 #include "media.h"
+#include "sb.h"
 
 typedef struct _Termcell      Termcell;
 typedef struct _Termatt       Termatt;
@@ -163,7 +164,10 @@ struct _Termpty
    Backlog_Beacon backlog_beacon;
    int w, h;
    int fd, slavefd;
-#if defined(ENABLE_FUZZING) || defined(ENABLE_TESTS)
+#if defined(ENABLE_TESTS)
+   struct ty_sb write_buffer;
+#endif
+#if defined(ENABLE_FUZZING)
    int fd_dev_null;
 #endif
    struct {
diff --git a/src/bin/tyfuzz.c b/src/bin/tyfuzz.c
index c5106eb4..70da12cf 100644
--- a/src/bin/tyfuzz.c
+++ b/src/bin/tyfuzz.c
@@ -172,8 +172,12 @@ _tytest_checksum(Termpty *ty)
      {
         MD5Update(&ctx, (unsigned char const*)"(NULL)", 6);
      }
+   /* Cursor shape */
    MD5Update(&ctx, (unsigned char const*)_cursor_shape,
              strlen(_cursor_shape));
+   /* Write buffer */
+   MD5Update(&ctx, (unsigned char const*)ty->write_buffer.buf,
+             ty->write_buffer.len);
 
    MD5Final(hash, &ctx);
 
@@ -205,8 +209,10 @@ _termpty_init(Termpty *ty)
    assert(ty->screen2);
    ty->circular_offset = 0;
    ty->fd = STDIN_FILENO;
+#if defined(ENABLE_FUZZING)
    ty->fd_dev_null = open("/dev/null", O_WRONLY|O_APPEND);
    assert(ty->fd_dev_null >= 0);
+#endif
    ty->hl.bitmap = calloc(1, HL_LINKS_MAX / 8); /* bit map for 1 << 16 elements */
    assert(ty->hl.bitmap);
    /* Mark id 0 as set */
@@ -216,7 +222,12 @@ _termpty_init(Termpty *ty)
 static void
 _termpty_shutdown(Termpty *ty)
 {
+#if defined(ENABLE_TESTS)
+   ty_sb_free(&ty->write_buffer);
+#endif
+#if defined(ENABLE_FUZZING)
    close(ty->fd_dev_null);
+#endif
 }
 
 int
diff --git a/tests/dsr-kbd.sh b/tests/dsr-kbd.sh
new file mode 100755
index 00000000..346ec01d
--- /dev/null
+++ b/tests/dsr-kbd.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# fill space with E
+printf '\033#8'
+#set color
+printf '\033[46;31;3m'
+
+printf '\033[?26n'
diff --git a/tests/tests.results b/tests/tests.results
index fd2a3e89..2cf1bae5 100644
--- a/tests/tests.results
+++ b/tests/tests.results
@@ -14,8 +14,9 @@ cursor-shape-5.sh 21332951c006a2d91cf0f227758ff477
 cursor-shape-6.sh 21332951c006a2d91cf0f227758ff477
 cursor-shape-7.sh 5d0dadf7273d918cbcd99df95e56795e
 tabs.sh 960b74686e23e8e39c3446768b9efc75
-xterm-osc-0-title-icon.sh cb5080cc1dbc23b553b62fbdc8cbdf68
-xterm-osc-1-icon.sh 9202db6e81ce810f007035770934fecb
-xterm-osc-2-title.sh 49a058f1813bdd64faab1cf1af3ebe09
-dsr-cpr.sh 5a778fd856455475e695e5469e69d227
-dsr-dir.sh f7dde335d44f8691041d40c3efd24ffb
+xterm-osc-0-title-icon.sh edae688004c15739bcc5a10f51faa6ed
+xterm-osc-1-icon.sh be549a661504e4dcfb974dcccd7b0bdf
+xterm-osc-2-title.sh e8485fd460aba2a2ae1d4e63a1143b32
+dsr-cpr.sh a03cfba07a7b76075a4126f452d48ad5
+dsr-dir.sh 28b0d8b4b60f3c61d49cee69895a07b2
+dsr-kbd.sh 1c474c101697080a85563d9b5bc1505c